Item: DS3218 20KG Large Torque Digital Servo Stall Torque (5V): 19 kg/cm (263.8oz/in) Stall Torque (6.8V): 21.5 kg/cm (298.5 oz/in) Speed : 0.16 sec/60(5V) / 0.14 sec/60(6.8V) Operating Voltage: 4.8 ~ 6.8 DC Volts Dead brand: 3s Weight: 60 g (2.12 oz) Motor Type: DC Motor Gear Type: Copper & Aluminum Working frequence: 1520s / 333hz Size: 40..